Economizer

• Compact Structure designed for the recovery and use of Exhaust Gas waste energy,
• Robust Body Construction made of anti-corrosive painted steel material.
• St35 etc. Special winding Serpentine Pipe Group made of material.
• Pressure Manometer and Safety Valve integrated into the body.
• Exhaust Gas Bypass Circuit (in BP Models.)
 

 Flue Gas Economizer (Definition)

The most important energy loss in steam boilers is the flue gases coming out of the chimneys. This energy loss is reduced in the chimney with the lost heat recovery device.  

The recovered heat directly replaces the recovered energy, thus reducing the fuel consumed.

Flue Gas Economizer Usage Areas

Economizers are used in industry as lost heat recovery equipment.

It is generally used for heating of feed water. The feed water temperature in the boilers is usually below the flue gas temperature. 

Flue Gas Economizer Advantages

The heat capacity of the boiler is based on the selection of economizer. The feed water temperature can be increased up to 20 ºC below the saturation temperature in the boiler.

In the meantime, the flue gas temperatures can be cooled up to 50 ºC higher than the temperature of the water coming from the deaerator, provided that they are above the condensation temperature. In other words, the flue gas temperatures can be reduced to the order of 150 ºC. The economy made in this way means an increase in boiler efficiency by 5-7%.

Working Principles of Flue Gas Economizer System

In the most basic sense, the economizer works as a heat exchanger.

The feed water absorbs the lost heat in the flue gas passing through the economizer. Thus, while the temperature of the flue gas released to the atmosphere decreases, the temperature of the feed water taken into the steam boiler is increased.

The water fed to the steam boilers is prepared according to the specifications required by the standards by undergoing chemical and heat treatments and transferred to the economizer at a temperature of 103 °C or 90 °C. During the circulation in the economizer, the feed water cools the flue gas and heats itself. Reducing the flue gas temperature from 260 °C to 120 °C reduces flue gas losses by 6%.

A boiler with an economizer needs 6% less fuel at the assumed load point for the amount of steam produced. The heat recovered from the flue gas is taken back to the boiler by heating the feed water. Although it varies depending on the initial investment costs and fuel prices, the investment made in the economizer can be amortized in a single shift and in 9-12 months with an average boiler performance of 70%.